Piston-pump.



H. P. WEDIN.

PISTON PUMP.

APPLICATION FILED MAE. 1, 1909.

Patented Aug. 17, 1909.

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H. P. WEDIN.

PISTON PUMP.

APPLICATION FILED MAR. 1, 1909.

931,535. Patented Aug. 17,1909.

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UNITED STATES PATENT OFFICE.

HANS PERSSON WEDIN, OF OHRISTIANSTAD, SWEDEN.

PISTON-PUMP.

To all whom it may concern:

Be it known that I, HANS PERSSON WEDIN, a subject of the King of Sweden,and resident of Hvilans Gjuteri och Mekaniska Verkstad, Christianstad,in the Kingdom of Sweden, have invented certain new and usefulImprovements in Piston Pumps, of which the following is a specification,reference being had therein to the accompanying drawings.

, Piston pumps are before known or proposed, in which a body or plug,rotating in a casing with the driving or crank shaft of the pump andprovided with recesses or channels, connecting the pump cylinder withthe suction and pressure pipes, is substituted for the ordinary suctionand pressure valves. In the said pumps, which, in order to becomeeffective, are provided with a plurality of cylinders, each cylinder is,however, single acting, due to the fact that only the cylinder chamberoutside the corresponding piston has a channel leading to the saidcasing, so that it is connected with the suction and pressure pipesalternately, while the. cylinder chamber inside the piston has nochannel of the said kind and consequently is inactive.

This invention relates to a piston pump provided with a rotating body orplug of the said type, in which pump the cylinder or each cylinder isdouble acting. For the said purpose not only the cylinder chamberoutside the piston but also the cylinder chamber inside the same has achannel leading to the inner periphery of the said casing,the mouths ofthe suction and pressure pipes of the pump being besides so located inthe inner peripheryof the casing, that the rotating body by means of itschannels connects the cylinder chambers with the suction and pressurepipes alternately. Through the said arrangements the pump cylinderbecomes double acting and has, at least, the same effect as two singleacting cylinders together in pumps of the type first mentioned, whichpumps, besides, are expensive, cause a great loss of power owing to thefriction of the pistons and take up a great deal of space.

In the accompanying drawings Figures 1 to 4: and 5, 6 illustrate twoforms of the invention. Fig. 1 is a section on the line A-B of Fig. 2,viewed in the direction of the arrows, and shows the rotary body, thecasing of the same and the suction and pressure Specification of LettersPatent.

Application filed March 1, 1909.

Patented Aug. 17, 1909.

Serial No. 480,742. 4

pipes of the pump. Fig. 2 is a vertical cross-section of the pump. Fig.3 is a section on the line CD of Fig. 2 viewed in the direction of thearrows. Fig. 1 is a horizontal section of the pump on the line E-F ofFig. 2. Fig. 5 is a section on the line GH of Fig. 6, which is ahorizontal section of the pump according to the second form of theinvention.

1, Figs. 1 to L, is the cylinder of the pump and 2 the piston. Theinner, open end of the cylinder 1 communicates with the closed crankchamber 3. The piston 2 is connected with a crank 5 by means of a rod a,the said crank being provided on the inner end of a shaft 6. The saidshaft 6 is rotatably mounted in a casing 7 provided on the pump casingand forms in the present case the rotatable body or plug, replacing thevalves and efiecting the communication between the pump cylinder and thesuction and pressure pipes of the pump. A crank 9 is fixed to the shaftor plug 6 by means of a screw 8 for the operating of the pump manually.The pump may, however, easily be arranged to be operated by a motor.Channels 10 and 11 communicate with the chambers on both sides of thepiston 2, and the mouths of the said channels are located in the innersurface of the casing 7 in the same or substantially the same crosssection of the casing and opposite or substantially opposite each other.The suction pipe 12 of the pump has two branches 13, 14, which embracethe casing 7 and the mouths of which are located in the inner surface ofthe same on a level with the mouths of the channels 10 and 11respectively. Also the pressure pipe 15 of the pump has two branches 16and 17, which embrace the casing 7 and the mouths of which are locatedalso on a level with the mouths of the channels 10 and 11 respectively.The pressure pipe 15 with its branches 16, 17 is located on oppositesides of the mouths of the channels 10, 11 with relation to the branches13, let of the suction pipe 12. Two recesses or channels 18, 19 areprovided in the plug 6 011 each side of the same and extend in oppositedirections from the cross section of the easing, in which the mouths ofthe channels 10, 11 are situated, so that when the plug 6 is rotated,the channel 18 connects the channels 10 and 11 with the branches 13, laof the suction pipe 12 alternately, and the channel 19 connects thechannels 10 and 11 with the branches 16, 17 of the pipe 15 alternately.I The position of the body 6 is so adapted with relation to the piston2, that the channel 18 connects the channel 10 with the suction pipe 12,and the channel 19 connects the channel 11 with the pressure pipe 15, asthe piston 2 is moved inward, and vice versa as the piston is movedoutward.

The pump acts in the following manner. If the shaft or plug (5 isrotated in the direction indicated by the arrow shown in Fig. 8, thewater or liquid is sucked through the pipe 12, the branch 13 and thechannels 18, 10 into the cylinder chamber outside the piston 2, at thesame time as the piston 2 forces the water through the chamber 3 insidethe piston, the channels 11, 19, the branch 17 and the pipe 15. As thepiston returns to its innermost position, the position of the channels18, 19 is then reversed, so that the water sucked into the cylinderchamber outside the piston 2 is now forced upward into the pipe 15through the channels 10, 19 and the branch 16, while water is suckedinto the chamber 3 inside the piston through the pipe 12, the branch letand the channels 18, 11. Consequently, it is seen, that the pump isdouble acting. The pipes 12 and 15 may, evidently, entirely inclose theplug 6 and be open inward all around, so that the channels 18, 19communicate with the same continuously.

The pump shown in Figs. 5 and 6 differs from the pump described aboveonly by the recesses 18, 19 of the rotatable plug 6 ending in each oftwo recesses 20, 21 extending around the body 6. The suction pipe 12ends, without branches, in the casing 7 at the recess 20, and thepressure pipe 15 ends in the same manner at the recess 21.

As the piston 2 is moved inward, water is sucked through the pipe 12,the recess 20 and the channels 18, 10 into the cylinder chamber outsidethe piston 2, while the water in the chamber 3 inside the piston 2 isforced through the channels 11, 19 and the recess 21 into the pipe 15and vice versa, as the piston returns.

In both the forms of the invention described above the channels 18, 19are provided in the surface of the rotatable body or plug 6. They may,however, be provided within the plug and only the mouths of the channelsmay be located in the surface of the said plug. Further the piston 2may, evidently, be connected with the plug 6 by means of a gearing orthe like substituting the rod 4, as easily understood by those skilledin the art. Two or more cylinders with connecting channels and rotatableplugs of the described type may, evidently be combined in one pump.

Having now described my invention, what I claim as new and desire tosecure by Letters Patent is:

1. In a piston pump the combination with the cylinder, the piston andthe driving shaft, of a casing, a plug provided in the casing androtating with the said shaft, channels (10, 11) leading from thecylinder chambers on both sides of the piston to the inner periphery ofthe said casing, a suction pipe and -a pressure pipe, having theirmouths located in the casing, and channels provided in the said plug andconnecting the channels (10, 11) with the suction and pres sure pipesalternately, as the plug is rotated, substantially as described and forthe pur pose set forth.

2. In a piston pump the combination with the cylinder, the piston andthe driving shaft, of a casing, a plug provided in the easing androtating with the said shaft, channels (10, 11) leading from thecylinder chambers on both sides of the piston to the inner periphery ofthe said casing, a suction pipe and a pressure pipe, having their mouthslocated in the inner periphery of the casin on opposite sides of themouths of the channels (10, 11), and channels provided in the said plugand connecting the channels (10, 11) with the suction and pressure pipesalternately, as the plug is rotated, substantially as described and forthe purpose set forth.

3. In a piston pump the combination with the cylinder, the piston andthe driving shaft, of a casing, a plug provided in the casing anddotating with the said shaft, channels (10, 11) leading from thecylinder chambers on both sides of the piston to the inner periphery ofthe said casing and having their mouths located in the same crosssection of the casing, a suction pipe and a pressure pipe embracing thesaid casing and having their mouths located in the inner periphery ofthe casing on opposite sides of the said cross section, and longitudinalchan' nelsin the said plug connecting the channels (10, 11) with thesuction and pressure pipes alternately, as the plug is rotated,substantially as described and for the purpose set forth.

4. In a piston pump the combination with the cylinder and the piston, ofa casing, a plug provided in the said casing at right angles to the pathof the said piston and forming the driving shaft of the piston, meansfor rotating the said plug, channels (10, 11) leading from the cylinderchambers on both sides of the piston to the inner periphery of the saidcasing and having their mouths located in the same cross section of thecasing, a suction pipe and a pressure pipe embracing the casing andhaving their mouths located in the inner periphery of the casing, onopposite sides of the said cross-section, and longitudinal channels inthe said plug connecting the channels (10, 11') with the suction andpressure pipes alternately, as the plug is rotated, substantially asdescribed and for the purpose set forth.

5. In a piston pump the combination with the cylinder, the piston andthe driving shaft, of a casing, a plug provided in the said casing androtating with the said driving shaft, channels (10, 11) leading from thecylinder chamber on both sides of the piston to the inner periphery ofthe said casing, recesses provided in the plug on opposite sides of themouths of the said channels (10, 11) and extending around the plug, asuction pipe and a pressure pipe communieating with the said recessesrespectively, and longitudinal channels in the plug connecting thechannels (10, 11) with the said recesses alternately as the plug isrotated, substantially as described and for the purpose set forth.

In witness whereof, I have hereunto signed my name in the presence oftwo subscribing witnesses.

HANS PER-S SON VEDIN.

Witnesses J. PERSSON, J OHN JOHNSON.

